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Drug release from zein fibers. (a) Cumulative drug release of tetracycline hydrochloride (T) and 4-epitetracycline from the freshly prepared samples. (b) Cumulative drug release of T and 4-epitetracycline from samples stored for 4 months. Key: PEO, polyethylene oxide; SA, stearic acid; T, tetracycline hydrochloride; Z, zein; m, minutes; h, hours; d, days; error bars represent standard deviation.
